CCalendarEvent::SetExDate

static function SetExDate($exDate = [], $untilTimestamp = false)
{
	if ($untilTimestamp && !empty($exDate) && is_array($exDate))
	{
		$exDateRes = [];

		foreach($exDate as $date)
		{
			if (CCalendar::Timestamp($date) <= $untilTimestamp)
			{
				$exDateRes[] = $date;
			}
		}

		$exDate = $exDateRes;
	}

	$exDate = array_unique($exDate);

	return implode(';', $exDate);
}